MONTE ???

[bustercrab]

I read that a Compass user with the X100 turned the 1 turn GB into a 20 turn GB. How was this done.

 

[SNOWY]

Snowy here BC,
a couple of years ago there was a post by a guy in the States about a vernier knob you just replace a standard knob with.
This vernier knob also had a transparent top under which was a scale and indicator to show where you were set.
It was only a small knob; didn't seem to be much larger than the standard knob.

A far cry from the old vernier drives we used to fit to our old Deepseekers and Coinmasters back in the late '70' and early '80s on the Australian goldfields.
From memory the old vernier drives had a knob of about 1 1/4" dia. ~ too big I reckon !
But we found we could get a far more finely adjusted ground balance, with the extra turns the vernier gave us .

 

[JB(MS)]

All that's required is to replace the 1 turn pot (potentiometer) with a 20 turn pot of the same value. Probably not necessary but before desoldering the 1 turn pot, turn it to it's limit in either direction, then turn it back until it's in the center of it's adjustment range. Do the same to the 20 turn pot before soldering it in.

 

[Monte]

[size=medium]worked effectively enough for most people, but they would upgrade or modify it ... for a fee. if you sent it in. They would install a 10-turn wire-wound potentiometer. This provided more fine-tuning ability.

The Challenger X-200, a rather short-lived offering before th bellied-up, had a 10-turn pot, and a toggle to select salt or soil balancing. They advertised that that gave it the effective range of a 20-turn GB control, but it didn't due to broad overlapping.

Personally, the number of turns a control had for effective ground balancing varies from make-to-make and even model-to-model. For example, the early Bandido series had a 10-turn control and the two